Removed obsolete/deprecated content

The Canterbury legacy application framework has been dropped in v2022, let's then remove reference to it.

There are still references, as some documents cover the transition, those changes will be updated in a follow up merge request.

Signed-off-by: default avatarSagar SagarKishore.Benani@in.bosch.com Signed-off-by: default avatarWalter Lozano walter.lozano@collabora.com